Considering the VERY, LOW, WTF, OMG sales on WiiFit in Others, I would presume the title probably broke the 1 mil barrier 1st week last week by taking Others' shipments. But the question is, by how much? I would say it probably beat Brawl's launch by at least 200k. (1.6 mil 1st week here in the Us. Remember that this is just my guess.)
I seen Wiifit when I was heading to Virgin Records. The crowd was so huge, I had to cut freakin corners to get there. There is even Nintendo Channel footage of the event. (which I'm sure reached a lot of people's Wiis yesterday.)
No need to be alarmed about WiiFit's sales though. I would have commented on Haze 's great selling for such an average game, but I remember how my life went to hell when I rented Lair, that I stopped playing my Ps3 for 1 month, and played my Wii forever.